Here is a color test for the robots eyes. I still feel that the light blue works the best. After checking some of our references, I noticed that wall-e doesn't necessarily have a color to his eyes, as they don't glow at all, but act much like a normal lens. The iron giant, however, has glowing eyes that seem to usually be white or yellow, but change based on context (especially if painted for a movie poster). In the last image, I gave him some wall-e eyes and tinted them the blueish color. It may work, but wall-e is far more realistic than our robot will be.
So it was suggested that I change the color of the alpacas and the suit to something more pinkish, so that it would provide a better contrast against the green/yellow landscape. Here is the result. I've also included a paint over of one of the layout scenes.